1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
<?php
namespace SMW\SQLStore\QueryEngine;
use RuntimeException;
use SMW\MediaWiki\Database;
use SMW\SQLStore\TableBuilder\TemporaryTableBuilder;
/**
* @license GNU GPL v2+
* @since 2.3
*
* @author Markus Krötzsch
* @author mwjames
*/
class HierarchyTempTableBuilder {
/**
* @var Database
*/
private $connection;
/**
* @var TemporaryTableBuilder
*/
private $temporaryTableBuilder;
/**
* Cache of computed hierarchy queries for reuse ("catetgory/property value
* string" => "tablename").
*
* @var string[]
*/
private $hierarchyCache = [];
/**
* @var array
*/
private $hierarchyTypeTable = [];
/**
* @since 2.3
*
* @param Database $connection
* @param TemporaryTableBuilder $temporaryTableBuilder
*/
public function __construct( Database $connection, TemporaryTableBuilder $temporaryTableBuilder ) {
$this->connection = $connection;
$this->temporaryTableBuilder = $temporaryTableBuilder;
}
/**
* @since 2.3
*/
public function emptyHierarchyCache() {
$this->hierarchyCache = [];
}
/**
* @since 2.3
*
* @return array
*/
public function getHierarchyCache() {
return $this->hierarchyCache;
}
/**
* @since 2.3
*
* @param string $table
* @param integer $depth
*/
public function setPropertyHierarchyTableDefinition( $table, $depth ) {
$this->hierarchyTypeTable['property'] = [ $this->connection->tableName( $table ), $depth ];
}
/**
* @since 2.3
*
* @param string $table
* @param integer $depth
*/
public function setClassHierarchyTableDefinition( $table, $depth ) {
$this->hierarchyTypeTable['class'] = [ $this->connection->tableName( $table ), $depth ];
}
/**
* @since 2.3
*
* @param string $type
*
* @return array
* @throws RuntimeException
*/
public function getHierarchyTableDefinitionForType( $type ) {
if ( !isset( $this->hierarchyTypeTable[$type] ) ) {
throw new RuntimeException( "$type is unknown" );
}
return $this->hierarchyTypeTable[$type];
}
/**
* @since 2.3
*
* @param string $type
* @param string $tablename
* @param string $valueComposite
* @param integer|null $depth
*
* @throws RuntimeException
*/
public function createHierarchyTempTableFor( $type, $tablename, $valueComposite, $depth = null ) {
$this->temporaryTableBuilder->create( $tablename );
list( $smwtable, $d ) = $this->getHierarchyTableDefinitionForType( $type );
if ( $depth === null ) {
$depth = $d;
}
if ( array_key_exists( $valueComposite, $this->hierarchyCache ) ) { // Just copy known result.
$this->connection->query(
"INSERT INTO $tablename (id) SELECT id" . ' FROM ' . $this->hierarchyCache[$valueComposite],
__METHOD__
);
return;
}
$this->buildTempTable( $tablename, $valueComposite, $smwtable, $depth );
}
/**
* @note we use two helper tables. One holds the results of each new iteration, one holds the
* results of the previous iteration. One could of course do with only the above result table,
* but then every iteration would use all elements of this table, while only the new ones
* obtained in the previous step are relevant. So this is a performance measure.
*/
private function buildTempTable( $tablename, $values, $smwtable, $depth ) {
$db = $this->connection;
$tmpnew = 'smw_new';
$tmpres = 'smw_res';
$this->temporaryTableBuilder->create( $tmpnew );
$this->temporaryTableBuilder->create( $tmpres );
// Adding multiple values for the same column in sqlite is not supported
foreach ( explode( ',', $values ) as $value ) {
$db->query(
"INSERT " . "IGNORE" . " INTO $tablename (id) VALUES $value",
__METHOD__
);
$db->query(
"INSERT " . "IGNORE" . " INTO $tmpnew (id) VALUES $value",
__METHOD__
);
}
for ( $i = 0; $i < $depth; $i++ ) {
$db->query(
"INSERT " . 'IGNORE ' . "INTO $tmpres (id) SELECT s_id" . '@INT' . " FROM $smwtable, $tmpnew WHERE o_id=id",
__METHOD__
);
if ( $db->affectedRows() == 0 ) { // no change, exit loop
break;
}
$db->query(
"INSERT " . 'IGNORE ' . "INTO $tablename (id) SELECT $tmpres.id FROM $tmpres",
__METHOD__
);
if ( $db->affectedRows() == 0 ) { // no change, exit loop
break;
}
// empty "new" table
$db->query(
'TRUNCATE TABLE ' . $tmpnew,
__METHOD__
);
$tmpname = $tmpnew;
$tmpnew = $tmpres;
$tmpres = $tmpname;
}
$this->hierarchyCache[$values] = $tablename;
$this->temporaryTableBuilder->drop( $tmpnew );
$this->temporaryTableBuilder->drop( $tmpres );
}
}
|
